I'm a fairly experienced GM creating and running a series of Delta Green games (a modern supplement for Call of Cthulhu). While my players and I enjoy the game, there are parts that bog down and get ...

Previously I've wanted to get into Call of Cthulhu, but hadn't ever gotten around to it. I found out about Achtung! Cthulhu, created by Modiphius, which can be played within the Call of Cthulhu world. ...

I'm about to run Masks of Nyarlathotep for the first time. In the very first scenario, Jackson Elias is murdered by cultists, which kick starts the adventure. However, the scenario assumes that the ...

I'm GM of a Call of Cthulhu 6th edition table and I've got a question about dice.
Most of the time they're (and I'm) just using dice from my "ol collection" with pretty much every existing standard ...

I am trying to put together a couple of Call of Cthulhu games for my local gaming group and to run some games at Mid South Con. Now I am not familiar with the system or anything, I have heard older ...

What changes are there between each edition so that I can update earlier edition modules more easily?
I have many modules for Call of Cthulhu that I have picked up over the years but I only own 3rd ...

This question could be also How to avoid teleport/drop bomb/teleport back attacks? or How to avoid the use of Dimensional Shamblers as bomb carriers?
Background
Recently my group of players thought ...

What RPG systems are there for a traditional Call of Cthulhu adventure (e.g. a basic premise of being investigators in 20th century/modern timeframe within the Lovecraft Mythos)? I know that there is ...

Are there any official (ie. published by Chaosium or its licensees) sources on what the Deep Ones (and, secondarily, similarly "human-scoped" creatures: ghouls, Mi-Go etc) of the Cthulhu Mythos are up ...

Is there an official stance - expressed in the publications of Chaosium and/or its licensees - on how Lovecraft and his works are incorporated metafictionally into the universe of Call of Cthulhu, if ...

If anyone has experience running a game like this, what are some common errors to avoid and tips you would give to a GM embarking on such a campaign?
Specifically I intend to have a 3 PC party with 2 ...

I'm currently storytelling a Delta Green chronicle and, while studying various resources and scenarios, I was extremely intrigued by a scenario called "The Bookstore". That is a great opportunity to ...

So, I'm currently running a Call of Cthulhu campaign and I'm trying to determine what to do with something along the lines of feats of strength and whatnot. I came upon a time when a character had to ...

What should a new (and not so experienced) GM watch out for when starting to run a game set in Charles Stross's Laundry universe? Note that all this could be applied to a Call Of Cthulhu game as well ...

I am in the process of planning a CoC game (or Trail of... I've not picked up a copy but it looks interesting) set a long time after the events of the Whisperer in the Darkness. To do so, I wanted to ...

When I run Trail of Cthulhu and I need to prepare for a combat quickly, I scribble down something like the following:
Gangster: Athletics 10, Health 10
Those are the minimum statistics I need to run ...

In a Call of Cthulhu adventure, a particular clue is concealed in a room.
In Trail of Cthulhu, you'd spend a point of Evidence Collection. What would you do in Call of Cthulhu?
The rules I have are ...

I like it when, in Cthulhu games, Investigators go mad. With that in mind, I'd like to give some reward for the first Investigator to go mad.
For example, perhaps, at the beginning of the next game, ...

Community wiki post. Everyone can add an answer containing a short idea for a campaign, be it an event, a characteristic of the world, an artifact or object, or an NPC character. Fellow masters can ...